Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 3,535	$ 7,106	$ 7,822	$ 16,016
Cost of goods sold	7,586	12,261	17,292	26,280
Gross loss	(4,051)	(5,155)	(9,470)	(10,264)
Operating expenses:
General and administrative	2,695	2,188	4,462	4,256
Sales and marketing	361	354	752	692
Research and development	652	603	1,231	1,036
Loss on disposal of assets	126	22	126	22
Asset impairment charge	265		265
Loss from operations	(8,150)	(8,322)	(16,306)	(16,270)
Other income (expense):
Interest income	19	21	43	37
Interest expense	(36)	(24)	(71)	(47)
Realized (loss) gain on foreign currency translation	(216)	(204)	467	(561)
Total other income (expense)	(233)	(207)	439	(571)
Loss before income taxes	(8,383)	(8,529)	(15,867)	(16,841)
Income tax benefit (expense)	174	(51)	325	(87)
Net loss	$ (8,209)	$ (8,580)	$ (15,542)	$ (16,928)
Net loss per common share
Basic	$ (0.31)	$ (0.33)	$ (0.59)	$ (0.65)
Diluted	$ (0.31)	$ (0.33)	$ (0.59)	$ (0.65)
Weighted average common shares outstanding used in computing net loss per common share	26,296,398	26,142,261	26,261,506	26,135,768